<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>

    <div id="title">哈哈哈哈哈</div>

    
    <script src="../jquery/jquery.js"></script>

    <script>
    
        $(function(){
            var span = $("<span>").html("呀呀呀呀呀");


            console.log("span", span);

            $("#title").append(span);
        })

    </script>
</body>
</html>